Acoustic diffraction by a disk in a viscous medium

2003 ◽  
Vol 114 (4) ◽  
pp. 2332-2332
Author(s):  
Anthony M. J. Davis ◽  
Raymond J. Nagem
Keyword(s):  
Viscous Medium ◽  
Acoustic Diffraction

Acoustic diffraction by a half plane in a viscous medium

1999 ◽  
Vol 106 (4) ◽  
pp. 2289-2289
Author(s):  
Allan D. Pierce ◽  
Raymond J. Nagem ◽  
Mario Zampolli
Keyword(s):  
Half Plane ◽  
Viscous Medium ◽  
Acoustic Diffraction

scholarly journals Current Development and Applications of Super-Resolution Ultrasound Imaging

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2417
Author(s):  
Qiyang Chen ◽  
Hyeju Song ◽  
Jaesok Yu ◽  
Kang Kim
Keyword(s):  
Kidney Disease ◽  
Ultrasound Imaging ◽  
Atherosclerotic Plaque ◽  
Super Resolution ◽  
Emerging Technology ◽  
Diffraction Limit ◽  
Disease Models ◽  
Current Development ◽  
Future Directions ◽  
Acoustic Diffraction

Abnormal changes of the microvasculature are reported to be key evidence of the development of several critical diseases, including cancer, progressive kidney disease, and atherosclerotic plaque. Super-resolution ultrasound imaging is an emerging technology that can identify the microvasculature noninvasively, with unprecedented spatial resolution beyond the acoustic diffraction limit. Therefore, it is a promising approach for diagnosing and monitoring the development of diseases. In this review, we introduce current super-resolution ultrasound imaging approaches and their preclinical applications on different animals and disease models. Future directions and challenges to overcome for clinical translations are also discussed.

scholarly journals Engineering a light-driven cyanine based double molecular rotor to enhance the sensitivity towards the viscous medium.

2021 ◽  
Author(s):  
Vishal Kachawal ◽  
Abhilasha Srivastava ◽  
Sumukh Thakar ◽  
Maria Zubiria-Ulacia ◽  
Diplesh Gautam ◽  
...  
Keyword(s):  
Viscous Medium ◽  
Molecular Rotor ◽  
Enhanced Sensitivity

This article describes the enhanced sensitivity to the viscous medium by a molecular rotor based fluorophore (RBF), TPSI I. The TPSI I molecule is designed in such a way that...

scholarly journals Sucrose solution as a new viscous test fluid with tunable viscosities up to 2 Pas for micromixing characterization by the Villermaux–Dushman reaction

2021 ◽  
Author(s):  
Elias Arian ◽  
Werner Pauer
Keyword(s):  
Sucrose Solution ◽  
Viscous Medium ◽  
Stirred Tank ◽  
Test Fluid ◽  
Tank Reactor ◽  
Experimental Implementation ◽  
Sucrose Solutions ◽  
Viscous Solution ◽  
First Time ◽  
Dushman Reaction

AbstractFor the first time, micromixing characterization for the Villermaux–Dushman reaction could be performed with a non-reactive viscous medium at viscosities up to 2 Pas. As viscous medium, sucrose solution was used with the benefit of being a Newtonian fluid with tuneable viscosity. Due to the higher viscosities in comparison to established media for micromixing investigations, a new protocol for the experimental implementation was developed. Micromixing experiments were conducted and the applicability of viscous sucrose solutions was proven in a stirred tank reactor. Major challenges in characterizing micromixing efficiency in high viscous solution were consolidated.

scholarly journals A graphical solution of a differential equation with application to hill’s treatment of nerve excitation

1937 ◽  
Vol 123 (832) ◽  
pp. 382-395 ◽  
Keyword(s):  
Viscous Medium ◽  
Graphical Solution ◽  
Initial Value ◽  
First Order ◽  
Rate Dependent ◽  
Monomolecular Reaction ◽  
Constant Coefficients ◽  
Linear Differential ◽  
Physical And Chemical ◽  
Nerve Excitation

Linear differential equations with constant coefficients are very common in physical and chemical science, and of these, the simplest and most frequently met is the first-order equation a dy / dt + y = f(t) , (1) where a is a constant, and f(t) a single-valued function of t . The equation signifies that the quantity y is removed at a rate proportional to the amount present at each instant, and is simultaneously restored at a rate dependent only upon the instant in question. Familiar examples of this equation are the charging of a condenser, the course of a monomolecular reaction, the movement of a light body in a viscous medium, etc. The solution of this equation is easily shown to be y = e - t / a { y 0 = 1 / a ∫ t 0 e t /a f(t) dt , (2) where y 0 is the initial value of y . In the case where f(t) = 0, this reduces to the well-known exponential decay of y .

Displacement of a rigid rod in a viscous medium

1994 ◽  
Vol 68 (5) ◽  
pp. 718-721
Author(s):  
F. L. Shevchenko ◽  
Z. E. Filer ◽  
V. S. Pashchenko ◽  
L. A. Solodova
Keyword(s):  
Viscous Medium ◽  
Rigid Rod

Biophysics of flagellar motility

1979 ◽  
Vol 12 (2) ◽  
pp. 103-180 ◽  
Author(s):  
Jacob J. Blum ◽  
Michael Hines
Keyword(s):  
Viscous Medium ◽  
Hydrodynamic Interactions ◽  
Eukaryotic Cells ◽  
Flagellar Motility ◽  
Muscle System ◽  
Structured Products ◽  
Filament System ◽  
Complex Organization ◽  
Propagating Waves ◽  
Sudden Appearance

One feature characterizing the transition from prokaryote to eukaryote is the ‘sudden’ appearance of centrioles and their highly structured products, the typical eukaryotic flagella and cilia. These mechanochemical systems appear as fully developed machines, containing some 200 diffierent proteins (Luck et al. 1978) arranged in a remarkably complex organization which has undergone little modification since the advent of the first eukaryotic cells. It is now well established (see, for example, Satir, 1974) that ciliary and flagellar motility is based on a sliding filament mechanism that superficially resembles the far more extensively studied sliding filament system of striated skeletal muscle.The flagellar system, however, appears to be much more complex than the muscle system, because it does not ‘merely’ shorten and generate force, but develops propagating waves and exerts its effects via hydrodynamic interactions with a viscous medium.

Two- and three-dimensional locomotion of the nematode Nippostrongylus brasiliensis

Parasitology ◽  
1990 ◽  
Vol 101 (2) ◽  
pp. 301-308 ◽  
Author(s):  
D. L. Lee ◽  
W. D. Biggs
Keyword(s):  
Sodium Alginate ◽  
Intestinal Mucosa ◽  
Three Dimensional ◽  
Viscous Medium ◽  
Nippostrongylus Brasiliensis ◽  
Two Dimensional ◽  
Immune Rejection ◽  
Forward Movement ◽  
Helical Wave ◽  
Dimensional Wave

Locomotion of adult Nippostrongylus brasiliensis has been studied in saline, in 0.6% agar, in sodium alginate of different viscosities and amongst sand grains in these media. In saline the nematode formed two-dimensional waves but there was little forward progression. Amongst sand grains in saline the nematode moved forwards by thrusting against sand grains, but thigmokinetic behaviour later resulted in quiescence. In 0.6% agar and in alginates of weak viscosity the nematode produced two-dimensional waves and sometimes a three-dimensional helical wave which resulted in forward movement. The formation of three-dimensional waves and the distance travelled increased with increasing viscosity up to 4% sodium alginate and also amongst sand gains in these media. In 8% sodium alginate the nematode became coiled like a spring but remained almost stationary. The three-dimensional wave is formed with torsion and obtains thrust from the viscous medium. In the intestine of the host thrust will be obtained from the mucus and villi of the intestinal mucosa. The ability of this nematode to move by two-and three-dimensional undulatory propulsion is probably related to its complex ridged cuticle. Attention is drawn to the role that increased viscosity of mucus may play in entrapping nematodes during their immune rejection.

Photo-acoustic determination of optical parameters of tissue-like media with reference to opto-acoustic diffraction

1997 ◽  
Vol 12 (4) ◽  
pp. 357-363 ◽  
Author(s):  
S. Lohmann ◽  
Chr. Ruff ◽  
Chr. Schmitz ◽  
H. Lubatschowski ◽  
W. Ertmer
Keyword(s):  
Optical Parameters ◽  
Acoustic Diffraction
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